CVE-2021-28550 (GCVE-0-2021-28550)

Vulnerability from cvelistv5 – Published: 2021-09-02 16:07 – Updated: 2025-10-21 23:25
VLAI? CISA KEV
Title
Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution
Summary
Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
Severity ?
9.6 (Critical)
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CWE
  • CWE-416 - Use After Free (CWE-416)
Assigner
References
Impacted products
Vendor Product Version
Adobe Acrobat Reader Affected: unspecified , ≤ 2020.001.30020 (custom)
Affected: unspecified , ≤ 2021.001.20150 (custom)
Affected: unspecified , ≤ 2017.011.30194 (custom)
Affected: unspecified , ≤ None (custom)
Create a notification for this product.
CISA KEV
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 2988c15f-5938-4922-8474-412bed7af2b4

Vulnerability ID: CVE-2021-28550

Status: Confirmed

Status Updated: 2021-11-03 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2021-11-03
Asserted: 2021-11-03
Scope
Notes: KEV entry: Adobe Acrobat and Reader Use-After-Free Vulnerability | Affected: Adobe / Acrobat and Reader | Description: Adobe Acrobat and Reader contains a use-after-free vulnerability that could allow an unauthenticated attacker to achieve code execution in the context of the current user. | Required action: Apply updates per vendor instructions. | Due date: 2021-11-17 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-28550
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-416
Feed CISA Known Exploited Vulnerabilities Catalog
Product Acrobat and Reader
Due Date 2021-11-17
Date Added 2021-11-03
Vendorproject Adobe
Vulnerabilityname Adobe Acrobat and Reader Use-After-Free Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-02 12:28 UTC | Updated: 2026-02-06 07:17 UTC
Show details on NVD website
To clipboard 

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    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"Adobe Acrobat Reader use after free vulnerability could lead to arbitrary code execution\", \"datePublic\": \"2021-05-11T00:00:00.000Z\", \"providerMetadata\": {\"orgId\": \"078d4453-3bcd-4900-85e6-15281da43538\", \"shortName\": \"adobe\", \"dateUpdated\": \"2023-03-28T00:00:00.000Z\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Acrobat Reader DC versions versions 2021.001.20150 (and earlier), 2020.001.30020 (and earlier) and 2017.011.30194 (and earlier) are affected by a Use After Free vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.\"}], \"affected\": [{\"vendor\": \"Adobe\", \"product\": \"Acrobat Reader\", \"versions\": [{\"version\": \"unspecified\", \"lessThanOrEqual\": \"2020.001.30020\", \"status\": \"affected\", \"versionType\": \"custom\"}, {\"version\": \"unspecified\", \"lessThanOrEqual\": \"2021.001.20150\", \"status\": \"affected\", \"versionType\": \"custom\"}, {\"version\": \"unspecified\", \"lessThanOrEqual\": \"2017.011.30194\", \"status\": \"affected\", \"versionType\": \"custom\"}, {\"version\": \"unspecified\", \"lessThanOrEqual\": \"None\", \"status\": \"affected\", \"versionType\": \"custom\"}]}], \"references\": [{\"url\": \"https://helpx.adobe.com/security/products/acrobat/apsb21-29.html\"}], \"metrics\": [{\"cvssV3_0\": {\"version\": \"3.0\", \"vectorString\": \"CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"CHANGED\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"availabilityImpact\": \"HIGH\", \"baseScore\": 9.6, \"baseSeverity\": \"CRITICAL\"}}], \"problemTypes\": [{\"descriptions\": [{\"type\": \"CWE\", \"lang\": \"en\", \"description\": \"Use After Free (CWE-416)\", \"cweId\": \"CWE-416\"}]}], \"source\": {\"discovery\": \"EXTERNAL\"}}, \"adp\": [{\"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-03T21:47:32.615Z\"}, \"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://helpx.adobe.com/security/products/acrobat/apsb21-29.html\", \"tags\": [\"x_transferred\"]}]}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-28550\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-04T18:17:32.968582Z\"}}}, {\"other\": {\"type\": \"kev\", \"content\": {\"dateAdded\": \"2021-11-03\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-28550\"}}}], \"timeline\": [{\"time\": \"2021-11-03T00:00:00+00:00\", \"lang\": \"en\", \"value\": \"CVE-2021-28550 added to CISA KEV\"}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-04T18:17:47.663Z\"}}]}",
      "cveMetadata": "{\"state\": \"PUBLISHED\", \"cveId\": \"CVE-2021-28550\", \"assignerOrgId\": \"078d4453-3bcd-4900-85e6-15281da43538\", \"assignerShortName\": \"adobe\", \"dateUpdated\": \"2025-07-30T01:38:01.904Z\", \"dateReserved\": \"2021-03-16T00:00:00.000Z\", \"datePublished\": \"2021-09-02T16:07:20.687Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.